// Copyright (C) Kumo inc. and its affiliates.
// Author: Jeff.li lijippy@163.com
// All rights reserved.
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published
// by the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program.  If not, see <https://www.gnu.org/licenses/>.
//
#pragma once

#include <pollux/core/i_typed_expr.h>

namespace kumo::pollux::exec::test {

class ExprTransformer {
 public:
  virtual ~ExprTransformer() = default;

  /// Transforms the given expression into a new expression. This should be
  /// called during the expression generation in expression fuzzer.
  virtual core::TypedExprPtr transform(core::TypedExprPtr) const = 0;

  /// Returns the additional number of levels of nesting introduced by the
  /// transformation.
  virtual int32_t extraLevelOfNesting() const = 0;
};

} // namespace kumo::pollux::exec::test
